在本論文中將探討 ZnAl2O4-TiO2陶瓷系統的微波介電特性及材料的微結構。由實驗結果顯示，ZnAl2O4-TiO2在1390℃燒結4小時，可得最佳之介電特性εr~25.2，Q׃~277000(at 9GHz)，τƒ~185ppm/℃。由於τƒ為正值，我們選擇添加τƒ為負值的Mg4Nb2O9(εr~12.9、Q׃~210000、τƒ~-70.4ppm/℃) 、MgTiO3(εr~17、Q׃~160000、τƒ~-55ppm/℃)及Mg0.95Ni0.05TiO3(εr~16.8、Q׃~230000、τƒ~-54 ppm/℃)調整其τƒ值。
此外，本論文還分別以FR4、Al2O3及0.5Mg4Nb2O9-0.5(ZnAl2O4-TiO2)作為基板來設計一圓形雙模態微帶線帶通濾波器，濾波器的規格為:中心頻率2.5GHz、頻寬約8%，並使用電磁模擬軟體HFSS來進行電腦模擬。

The microwave dielectric properties and the microstructures of the series of ZnAl2O4-TiO2 ceramics system were investigated. The experiment results show that ZnAl2O4-TiO2 has the best properties with sintering temperature at 1390℃, the dielectric properties are εr~ 25.2 , Q×f ~ 277000 (at 9GHz) , and τƒ~ 185ppm/℃. Concerning about the positive value of , we choose to add the Mg4Nb2O9(εr~12.9、Q׃~210000、τƒ~-70.4ppm/℃) 、MgTiO3(εr~17、Q׃~160000、τƒ~-55ppm/℃)及Mg0.95Ni0.05TiO3(εr~16.8、Q׃~230000、τƒ~-54 ppm/℃)to adjust the value.
Besides, a circle dual-mode microstrip bandpass filter on FR4、Al2O3 and 0.5Mg4Nb2O9-0.5(ZnAl2O4-TiO2) substrates have been designed. The band-pass frequency is 2.5GHz, the bandwidth is 8% and simulated by electromagnetic simulation software, HFSS.

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